syntax = "proto3";

package neo.fs.v2.container;

option go_package = "github.com/nspcc-dev/neofs-api-go/v2/container/grpc;container";
option csharp_namespace = "NeoFS.API.v2.Container";

import "netmap/types.proto";
import "refs/types.proto";

// Container is a structure that defines object placement behaviour. Objects can
// be stored only within containers. They define placement rule, attributes and
// access control information. ID of the container is a 32 byte long SHA256 hash
// of stable-marshalled container message.
message Container {
  // Container format version. Effectively the version of API library used to
  // create container.
  neo.fs.v2.refs.Version version = 1;

  // Identifier of the container owner
  neo.fs.v2.refs.OwnerID owner_id = 2;

  // Nonce is a 16 byte UUID, used to avoid collisions of container id
  bytes nonce = 3;

  // `BasicACL` contains access control rules for owner, system, others groups
  // and permission bits for `BearerToken` and `Extended ACL`
  uint32 basic_acl = 4;

  // `Attribute` is a user-defined Key-Value metadata pair attached to the
  // container. Container attribute are immutable. They are set at container
  // creation and cna never be added or updated.
  //
  // There are some "well-known" attributes affecting system behaviour:
  //
  // * Subnet \
  //   String ID of container's storage subnet. Container can be attached to
  //   only one subnet.
  message Attribute {
    // Attribute name key
    string key = 1;

    // Attribute value
    string value = 2;
  }
  // Attributes represent immutable container's meta data
  repeated Attribute attributes = 5;

  // Placement policy for the object inside the container
  neo.fs.v2.netmap.PlacementPolicy placement_policy = 6;
}